Lightboard Lessons: F5 BIG-IP DNS (GTM) iQuery Protocol Overview
Published Aug 09, 2017
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I don't have access to the source code so I can't be sure, but think of it like a virtual server with a single port and an iRule. You can do a lot of decision making during protocol negotiation with an iRule, where you can reject or accept based on criteria you evaluate in headers and/or payload.